svg.point.js v0.1.0

svg.point.js

This is a plugin for the svg.js library that add methods to SVG.Point.

Installation

npm install --save svg.point.js

Usage

How to include

In Html

Include this plugin after including svg.js in your html document.

CommonJs

You can just require this plugin, it will take care of requiring svg.js, perform the necessary modification and return you the modified SVG object.

var SVG = require('svg.point.js')

Or, you can require this plugin after having required svg.js.

var SVG = require('svg.js')
require('svg.point.js')

If you are using npm3, the two require in the code above would return a reference to the same object since npm3 install secondary dependencies in a flat way. That would not be the case if you are using npm2 since it installs all dependencies in a nested way.

// If using npm3
var SVG1 = require('svg.js')
var SVG2 = require('svg.point.js')
SVG1 === SVG2 // true
SVG1.Point.prototype.add != null // true

// If using npm2
var SVG1 = require('svg.js')
var SVG2 = require('svg.point.js')
SVG1 === SVG2 // false
SVG1.Point.prototype.add != null // false

Long story short, to avoid issues you should use npm3 if you plan to use this plugin with a CommonJs module bundler.

Creating a point

The SVG.Point constructor of svg.js allow passing the x and y coordinates that make up a point using any of the following ways.

As parameters

When 2 parameters are passed, the first one is used as the x coordinates and the other one as the y coordinate.

var point = new SVG.Point(3, 4)
point.x // 3
point.y // 4

When only one parameter is used and that parameter is not an object or an array, it is used as the value for both the x and y coordinates.

var point = new SVG.Point(7)
point.x // 7
point.y // 7

When no parameter are passed to the constructor, the x and y coordinates default to 0.

var point = new SVG.Point()
point.x // 0
point.y // 0

As an object

Any object that have an x and y attribute can be used to create a new SVG.Point.

var point = new SVG.Point({x:1, y:2})
point.x // 1
point.y // 2

point = new SVG.Point(new SVG.Point(3, 4))
point.x // 3
point.y // 4

As an array

Any array of at least two values can be used to specify the x and y coordinates. The first value of the array represent the x coordinate while the second value represent the y coordinate.

var point = new SVG.Point([5, 6])
point.x // 5
point.y // 6

Methods added by this plugin

Here are the methods added to SVG.Point by this plugin. Note that for any of those methods that require a point you can pass the x and y coordinates the same ways as for the SVG.Point constructor.

plus()

Create a new SVG.Point from the addition of the x and y coordinates of this point to the x and y coordinates of the passed point.

var point1 = new SVG.Point(7, 12)
var point2 = new SVG.Point(3, 8)
var point3 = point1.add(point2)

point3.x // 10
point3.y // 20

Also, since a point can be passed by passing a single number that represent both the x and y coordinates, you can perform an addition with a constant too.

var point1 = new SVG.Point(2, 25)
var constant = 4
var point2 = point1.add(constant)

point2.x //  6
point2.y // 29

returns: SVG.Point

minus()

Create a new SVG.Point from the soustraction of the x and y coordinates of this point to the x and y coordinates of the passed point.

var point1 = new SVG.Point(5, 12)
var point2 = point1.minus(6, 8)

point2.x // -1
point2.y // 4

Also, since a point can be passed by passing a single number that represent both the x and y coordinates, you can perform a soustraction with a constant too.

var point1 = new SVG.Point(2, 25)
var constant = 4
var point2 = point1.minus(constant)

point2.x // -2
point2.y // 21

returns: SVG.Point

times()

Create a new SVG.Point from the multiplication of the x and y coordinates of this point to the x and y coordinates of the passed point.

var point1 = new SVG.Point(5, 12)
var point2 = point1.times([6, 10])

point2.x // 30
point2.y // 120

Also, since a point can be passed by passing a single number that represent both the x and y coordinates, you can perform a multiplication with a constant too.

var point1 = new SVG.Point(2, 25)
var constant = 5
var point2 = point1.times(constant)

point2.x // 10
point2.y // 125

returns: SVG.Point

divide()

Create a new SVG.Point from the division of the x and y coordinates of this point to the x and y coordinates of the passed point.

var point1 = new SVG.Point(30, 49)
var point2 = new SVG.Point(5, 7)
var point3 = point1.divide(point2)

point3.x // 6
point3.y // 7

Also, since a point can be passed by passing a single number that represent both the x and y coordinates, you can perform a division with a constant too.

var point1 = new SVG.Point(18, 16)
var constant = 2
var point2 = point1.divide(constant)

point2.x // 9
point2.y // 8

returns: SVG.Point

equal()

Return true if the passed point is equal to this point, false otherwise.

var point1 = new SVG.Point(3, 7)

point1.equal(3, 7) // true
point1.equal(9, 7) // false

returns: boolean

toArray()

Return the x and y coordinates in an array of two values where the first value is x and the second value is y.

var point = new SVG.Point(13, 21)
point.toArray() // [13, 21]

returns: array

norm()

Calculate the Euclidean norm (i.e., sqrt(x^2 + y^2)).

var point = new SVG.Point([14, 26])
point.norm() // 29.5296461204668

returns: number

distance()

Return the distance between this point and the passed point.

var point1 = new SVG.Point(14, 22)
var point2 = new SVG.Point(30, 17)

point1.distance(point2) // 16.76305461424021

returns: number

Dependencies

svg.js >= v2.3.6

License

svg.point.js is licensed under the MIT License.